What is the reason for the uneven thickness of the needle punched non-woven fabric surface

Needle-punched non-woven fabrics sometimes have inconsistencies in thickness. So what causes it? Needle-punched non-woven fabrics belong to dry-laid non-woven fabrics. The short fibers are opened, carded, and laid into a fiber web, and then the fiber web is reinforced by needle punching to become a cloth. The needle-punched barbs are repeatedly pierced in the fiber web. After the hook tape fiber reinforcement, the needle punched non-woven fabric is finally formed. The composition of non-woven fabrics is messy, with little difference in warp and weft properties. Common products include needle-punched geotextiles and synthetic leather base fabrics. What is the reason for the uneven thickness of the needle punched non-woven fabric? So first of all, we need to confirm what link in the acupuncture production process caused the difference in thickness! 1. Whether the cotton web output by the carding machine is thick cotton, whether it is even, if so, check whether the carding gauge is loose, and then check whether the feeding part of the carding machine is bounced or intermittently stuck. If cotton or neps enter the carding machine, you need to continue to the direction of the cotton feeding box to find the cause. 2. Whether the speed of the netting machine trolley is stable and whether the speed compensation is well adjusted. 3. Whether the needles of the acupuncture machine have the same wear and tear, and whether there are new and old needles on the same needle punching machine that have not been properly adjusted. 4. Is the ironing machine adjusted?